[Costco] Battery Tender 4 amp charger and maintainer $49.99
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The Costco one will charge at 4amp which isn't alot and maintain your battery specially when the car isn't in use for longer period of time.
With freezing weather, better to keep your battery in tip top condition rather then half dead and be stuck somewhere to get a boost or call a tow truck.
Lot of US sites have this in tin can package for U$65. Even without the tin can, CAD$50 at store for $55 online is great price imo. https://www.summitracing.com/parts/dtn-022-0209dlwh
Reason: added price to title